XMLNode &after = entered_regionview->region()->playlist()->get_state();
session->add_command (new MementoCommand<ARDOUR::Playlist>(*(entered_regionview->region()->playlist()), &before, &after));
commit_reversible_command();
XMLNode &after = entered_regionview->region()->playlist()->get_state();
session->add_command (new MementoCommand<ARDOUR::Playlist>(*(entered_regionview->region()->playlist()), &before, &after));
commit_reversible_command();